Shelter



FIG. 1 is a perspective view taken from the front, top and one side of a shelter showing my new design;

FIG. 2 is a perspective view taken from the front, bottom and side opposite that shown in FIG. 1, with the door in a partially open position; and

FIG. 3 is a perspective view taken from the rear, top and side shown in FIG. 2.

The broken line representation of a tether rail in FIGS. 1, 2 and 3 and of stakes in FIG. 1 is for purposes of illustration only. 

The ornamental design for a shelter, substantially as shown and described. 